Answers

Add 63/21 and 45/20

1^st number: 3 0/21, 2^nd number: 2 5/20

63/21 + 45/20 is 21/4.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 20 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 21 × 20 = 420,
   63/21 = 63 × 20/21 × 20 = 1260/420
3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
   45/20 = 45 × 21/20 × 21 = 945/420
4. Add the two like fractions:
   1260/420 + 945/420 = 1260 + 945/420 = 2205/420
5. 2205/420 simplified gives 21/4
6. So, 63/21 + 45/20 = 21/4
   In mixed form: 51/4

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